Replaceable Universal 3D Sensor Tip M3 | Short Stylus Ruby Ball FI 4 mm - DARMET
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Description
Features and applications:
- X/Y/Z axis zero-point determination: Allows for precise zero-point determination of the workpiece in all three geometric axes.
- No recalibration required: The replaceable component design eliminates the need to recalibrate the device after installing a new stylus.
- Ruby tip FI 4 mm: A high-hardness synthetic ruby ball. Wear-resistant, which ensures stable geometry and measurement repeatability.
- Antimagnetic properties: The ruby tip does not react to magnetic fields and does not attract metal shavings or micro-chips, preventing measurement errors.
- M3 thread mounting: Direct mounting in the 3D sensor ensures system rigidity and fast disassembly.
Technical data:

| Parameter | Value |
|---|---|
| D1 | 4 mm |
| L | 27 mm |
| D2 | 7.5 mm |
| Thread | M3 |
The dial indicator was created thanks to the work of a 19th-century watchmaker from New England. John Logan of Waltham, Massachusetts, filed a US patent application on May 15, 1883, for what he called an "improvement in measuring instruments." Its external appearance did not differ from today's dial indicators, but the needle (indicator pointer) was actuated by an internal mechanism consisting of a watch chain around a barrel (spindle). The diameter of the spindle determined the indicator's magnification ratio. Later, Logan developed the rack and pinion assembly that is currently used in most mechanical dial indicators.
The full range of applications for this device was not appreciated for another 13 years, until one of Logan's associates, Frank Randall, another watchmaker from E. Howard Watch CO. in Boston, bought the patent rights from Logan in 1896. He then formed a partnership with Francis Stickney and began manufacturing dial indicators for general industry.


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